Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
bo sach » co sach, hoc sach
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
vi ca » vit ca, va ca, vi ha
li ca » ly ca

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky sang ma hoi. ((hieu qua) or (hieu quan)) am thuc va hanh ((vi ca) OR (li ca)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky sang ma hoi. ((hieu qua) OR (hieu quan)) am thuc va hanh ((vi ca) OR (li ca)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky sang ma hoi. ((hieu qua) or (hieu quan)) am thuc va hanh ((vi ca) OR (li ca)) viet".
• Adding a wildcard symbol may retrieve word variants: bo sach ky sang ma hoi. ((hieu qua) or (hieu quan)) am thuc va hanh ((vi ca) OR (li ca)) viet*.